[PATCH v4 4/4] common: spl: Add spl NVMe boot support

[Mayuresh Chitale <mchitale@ventanamicro.com>]

Add support to load the next stage image from an NVMe disk which may
be formatted as an EXT or FAT filesystem. Also protect the call to
env_get in blk_get_device_part_str with CONFIG_SPL_ENV_SUPPORT macro to
avoid link error when SPL_ENV_SUPPORT is not enabled.

Signed-off-by: Mayuresh Chitale <mchitale@ventanamicro.com>
---
 arch/riscv/include/asm/spl.h |  1 +
 common/spl/Makefile          |  1 +
 common/spl/spl_nvme.c        | 32 ++++++++++++++++++++++++++++++++
 disk/part.c                  | 10 ++++++----
 4 files changed, 40 insertions(+), 4 deletions(-)
 create mode 100644 common/spl/spl_nvme.c

diff --git a/arch/riscv/include/asm/spl.h b/arch/riscv/include/asm/spl.h
index 2898a770ee..9c0bf9755c 100644
--- a/arch/riscv/include/asm/spl.h
+++ b/arch/riscv/include/asm/spl.h
@@ -20,6 +20,7 @@ enum {
 	BOOT_DEVICE_SPI,
 	BOOT_DEVICE_USB,
 	BOOT_DEVICE_SATA,
+	BOOT_DEVICE_NVME,
 	BOOT_DEVICE_I2C,
 	BOOT_DEVICE_BOARD,
 	BOOT_DEVICE_DFU,
diff --git a/common/spl/Makefile b/common/spl/Makefile
index 5210ad0248..bad2bbf6cf 100644
--- a/common/spl/Makefile
+++ b/common/spl/Makefile
@@ -29,6 +29,7 @@ obj-$(CONFIG_$(SPL_TPL_)USB_STORAGE) += spl_usb.o
 obj-$(CONFIG_$(SPL_TPL_)FS_FAT) += spl_fat.o
 obj-$(CONFIG_$(SPL_TPL_)FS_EXT4) += spl_ext.o
 obj-$(CONFIG_$(SPL_TPL_)SATA) += spl_sata.o
+obj-$(CONFIG_$(SPL_TPL_)NVME) += spl_nvme.o
 obj-$(CONFIG_$(SPL_TPL_)SEMIHOSTING) += spl_semihosting.o
 obj-$(CONFIG_$(SPL_TPL_)DFU) += spl_dfu.o
 obj-$(CONFIG_$(SPL_TPL_)SPI_LOAD) += spl_spi.o
diff --git a/common/spl/spl_nvme.c b/common/spl/spl_nvme.c
new file mode 100644
index 0000000000..2af63f1dc8
--- /dev/null
+++ b/common/spl/spl_nvme.c
@@ -0,0 +1,32 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2023
+ * Ventana Micro Systems Inc.
+ *
+ */
+
+#include <common.h>
+#include <spl.h>
+#include <init.h>
+#include <nvme.h>
+
+static int spl_nvme_load_image(struct spl_image_info *spl_image,
+			       struct spl_boot_device *bootdev)
+{
+	int ret;
+
+	ret = pci_init();
+	if (ret < 0)
+		return ret;
+
+	ret = nvme_scan_namespace();
+	if (ret < 0)
+		return ret;
+
+	ret = spl_blk_load_image(spl_image, bootdev, UCLASS_NVME,
+				 CONFIG_SPL_NVME_BOOT_DEVICE,
+				 CONFIG_SYS_NVME_BOOT_PARTITION);
+	return ret;
+}
+
+SPL_LOAD_IMAGE_METHOD("NVME", 0, BOOT_DEVICE_NVME, spl_nvme_load_image);
diff --git a/disk/part.c b/disk/part.c
index 35300df590..d330c57ab4 100644
--- a/disk/part.c
+++ b/disk/part.c
@@ -467,10 +467,12 @@ int blk_get_device_part_str(const char *ifname, const char *dev_part_str,
 	}
 #endif
 
-	/* If no dev_part_str, use bootdevice environment variable */
-	if (!dev_part_str || !strlen(dev_part_str) ||
-	    !strcmp(dev_part_str, "-"))
-		dev_part_str = env_get("bootdevice");
+	if (IS_ENABLED(CONFIG_SPL_ENV_SUPPORT)) {
+		/* If no dev_part_str, use bootdevice environment variable */
+		if (!dev_part_str || !strlen(dev_part_str) ||
+		    !strcmp(dev_part_str, "-"))
+			dev_part_str = env_get("bootdevice");
+	}
 
 	/* If still no dev_part_str, it's an error */
 	if (!dev_part_str) {
-- 
2.34.1